Unauthorized firmware modifications pose significant security risks to electronic devices, making protection essential. The most common prevention methods include implementing secure boot processes that verify digital signatures before loading firmware, ensuring only authenticated code executes. Hardware-based security modules like TPMs and HSMs provide cryptographic protection for keys and sensitive operations. Firmware encryption prevents reading or modifying code without proper authorization. Access control mechanisms restrict physical and logical interfaces to authorized personnel only. Regular firmware updates from trusted sources patch vulnerabilities, while code signing and integrity checks validate firmware authenticity. System monitoring and tamper-evident hardware designs provide additional layers of protection against unauthorized modifications.